#include "../ourhdr.h"

int main(void)
{
    int n,int1,int2;
    char line[MAXLINE];
    while((n=read(STDIN_FILENO,line,MAXLINE))> 0 )
    {
        line[n] = 0;
        if(sscanf(line, "%d %d", &int1,&int2) == 2)
        {
            sprintf(line, "%d\n", int1 + int2);
            n = strlen(line);
            if(write(STDOUT_FILENO, line, n) !=n)
            {
                err_sys("write error");
            }
        }
        else
        {
            if(write(STDOUT_FILENO, "invalid args\n",13) != 13)
            {
                err_sys("write error");
            }
        }
    }
    exit(0);
}